Controller construction.



E. W. STULL.

CONTROLLER CONSTRUCTION.

APPLICATION FILED MAR. 31, 190B.

Patented av. 10

I ,NVENTOR Emm'ell W Stall ATTORNEY NE i H v u v w.......""..:. 1 o N v fi iul ll nly e e m Q v 2. e. Q J: R u w R o m 9w u 0m 9 fl am m Q 7K, O QV 9 5% O MN 7 ...N mrN ub Q E mm RE WITNESSES UNITED STATES PATENT OFFICE.

EMMETT W. STULL, OF NORWOOD, OHIO, ASSIGNOR TO BLLIS-(FHALMEKS U'L'FMPAN Y, A GU11;- PORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING COMPANY A CORPQRATION OF OHIO.

Specification of Letters Patent.

Patented Nov. 10, 1908.

Applicatiozrflled Mai'ch BI, 1906. Serial No. 309,028.

To all whom 'it may concern:

Be it known that I, Emm'rr W. 'S'rU'LL,

, citizen of the United States, residing at Nortrollers for electric railway cars.

One object of my invention is to greatly reduce or entirely eliminate the s arkin at the contacts of the controller, an -.there y prevent damage to, or perhaps even the destruc tion of, the controller or the motors connected thereto.

' Another object of my invention is to obtain better engagement between the con'- tact fingers and contact segments 'of the .controller.

Broadly, my invention consists of the combinat-ion with a controlling drum, of contact fingers cooperating with the drum, and a blowout magnet having the contact fingers for" ole-pieees.

ore specifically considered, the invention comprises a controller drum having a paramagnetic shaft, a blowout magnet, the core of which extends beyond its windings, parama netic contact fingers with a hning of highly conductive material cooperatin with the controller drum and mounted on t e extended core of the blowout magnet, thus forming pole-pieces of one olarity for the blowout magnet, the contro ler shaft forming part of the return magnetic circuit thereof. Other features of my invention will more clearly appear in the following descri tion and accompanying drawings, and wi l be specifically pointed out in the appended c aims. Figure 1 is an elevation of a simple form of controller, with the front part of the casin removed, showing my invention applie thereto, and with the controller drum shown partly in section. Fig. 2 is a section on the ne 2'2 of Fig. 1; and, Fig. 3 is a detail of one of the contact fingers.

In the drawings, A is the back part of a controller casin provided with bearin s B, B for the she. t C of the controller rum which has the usual handle 0' and notch plate 0'. Surrounding the shaft is alayer of insulation D. Spaced from the insulation by collars E is a tube or tubes F to which are fastened as by screws the brass spiders for the copper or other highly. conductive contact segments G. The parts A, B,,B, C,.E, and F are all of iron or other parama netic material. Thus the tubes F, save for t e insulation D, are practically ma netically continuous with the shaft C, an the latter is magnetically continuous with the casing A. Insulating washers F are andbottom of the drum.

While each contact segment is shown as mounted on a separate spider, the spiders being connected only through the tube F, it is obvious that all the spiders for the same section of the drum might be directly connected to ether as by being integral.

ntegral or otherwise magnetically continuous with the" back of the easin A. is the core H of the blowout coil I, whic may be connected in any desired manner, the connections of the controller and of the blowout coil forming no art of my present invention.

'Fasten'd at its ower end to the core H, as by means of screws, so as to be magnetically continuous therewith, and supported at its upper end by a block K of woo or other nonmagnetic material, is an iron or other aramagnetic extension L of the core H o the blowout magnet. This extension L serves not only as a path for the magnetic flux, but also as a' su port for the contact fingers M, which are a 1ustably attached to the exten sion L,.as by the s lit iron collars N. These collars are refera ly insulated from the extension L o the blow-out magnet core.

The contact fingers M are each made of a strip 0 of spring steel, iron or other magnetic material having a high permeability, backed or lined by another strip P of highly conductplaced at the top ive material such as copper so as to make the fin ers better conductors. To the end of eac finger may be riveted a co per button Q. The strips 0 of the contact ngers form pole-pieces of one clarity for the blowout magnet, the contro ler shaft C and the tube F forming part of the return magnetic circuit thereof.

The path of the flux from the blowout magnet is from the core I-I, along extension L, to the collars N and pole-pieces or contact fingers M, across the air gap iri which the I breaking of the circuit takes place-to tube F,

by collars E to shaft C, bearings B, B, casing A, to core ]-I. In order to revent magnetic leakage, the cover A. and wise A may be of brass or other non-magnetic material. The magnetic attraction between the fingers M and the shaft C and tube F, serves also to cause a firmer contact between the fingers M and the segmcn ts Gr, thus assisting the spring action of the fingers themselves. This mag nctic attraction increases with the strength of the current tljirough the blowout coil, and. therefore the greater the current through. the coil and fii'igers the firmer the engagement between lingers M and segments I have described my invention in. what I now consider to be its preferred form, but I do no t wish to limit myself to the exact structure shown and described, and therefore .I shall claim broadly the novel features invcnted by me.

, I claiin as new:

1. In a controller, a controlling drum, a blowout magnet, and contactfingers formed of a spring strip of magnetic material and a strip of good conducting materiel mounted on the core of said blowout Ina. net and 00- operating with said drum, said 'iingers forming pole-pieces for said blow-out magnet.

2. In controller, a controlling drum having a paramagnetic shaft, a blowout magnet.

having its core cX tension beyond its windings,

and paramagnetic contact fingers lined with high y conductive material mounted on but gers serving as pole-pieces of one p larity for the blowout magnet, and said sheila forming part of the return magnetic circuit thereof.

3. In a controller, a blow-out magnet, a cylinder carrying drum contacts, and a shaft supporting said cylinder but insulated therefromsaid shaft-and cylinder being of magnct'ic .n'iaterial and forming part of the magnetic circuit of said blow-out magnet.

4. Inc controller, a blow-out magnet, a

hollow cylinder carrying drum contacts, a. shaft extending axially through-said cylinder, and one or more collars between said shaft'and cylinder, said shaft, cylinder and collars being all of magnetic material and forming part of the magnetic circuit of said blow-out magnet.

5. In a controller, a blow-out magnet, a hollow iron cylinder carrying drum contacts, an iron shaft extending axially through said cylinder, and one'or more iro'n collars supported by but insulated from said shaft and supporting said cylinder, said cylinder, shaft and collars forming part of the magnetic oir-, cuit of said blow-out Ina net.

In testimony whercofafiix my signature, in the presence of two witnesses.

EMMETT W.STULL.

VVit-nesses GEO. B. SonLEY, FRED J. KINSEY'.

insulated from said core extension, said fin- 

